Toto Carlyle MS874114SG Replacement Part Numbers for all internal guts

I have (3) Toto Carlyle MS874114SG toilets that are probably from 2001 and 2002.
One makes a humming noise and I'd like to replace all the internal parts with genuine replacement parts and G-Max technology.

What are the part numbers that I need in order to order them?
Is there an online plumbing website recommended for these Genuine Toto Replacement parts?
I've never replaced any toilet parts and am wondering if this is a challenging task for the female brain?
I'm hoping replacement instructions will be included, is this correct?
And will I need any special tools?
Thanks....

Yep. Korky builds parts for Toto. They are authorized replacements. The Korky 2021BP (or 2021PK) flapper just replaces the old flapper. It is quite literally the same thing in a Korky box rather than the Tot box. Some Lowes don't carry those, so get the Korky 3060BP which almost all Lowes' have. It's adjustable and the instructions show you how to set it for your specific toilet. Your toilet takes the same setting as the Toto Drake ST743.

Changing the whole flush valve is a much-bigger deal, totally unncessary, and makes no sense. Unless you have a crack in the flush valve, you never need to replace it.

And quit worrying about buying "official" Toto parts. What we are recommending are parts that are made by the same guys who MAKE the official Toto parts for Toto, and which are authorized replacements.